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Modern resumes should be results-oriented. That is, they are based on skills and existing achievements. After reading your resume, the employer should quickly understand how you can benefit the company. If you need to indicate several positions in one company on your resume, here https://www.gotresumebuilder.com/faq/how-do-i-list-multiple-positions-at-the-same-company-on-my-resume you can find more information on how to do this